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UCD90124 with Virtex FPGA, Temperature sensing

marc48123
Prodigy 210 points
Other Parts Discussed in Thread: UCD90124

Hi all

I am using a UCD90124 for the voltage monitoring and sequencing for a FPGA design. I will also use the fan controller inside the UCD90124. I would like to attach the internal temperature sensing diodes of the Virtex-6 to read the temperature of the FPGA directly with the UCD. Does anybody have a example schematic? I think the schematic of figure 11 in the datasheet is almost what I need. But how can I configure the TEMP_BIAS pin in the Fusion Digital Power Designer? I found a command TEMPERATURE_BIAS_PIN in the command list but it doesn't look like this command is supported in the designer... Any suggestions?

Regard, Marc

  • 0
    TI__Intellectual 2340 points

    Marc,

    The schematic of figure 11 is how you connect the diode to a GPO and a MON pin of the ucd90124.

    The Fusion software does not have access to configure the TEMP_BIAS pin directly. To configure a GPO in Temp Bias mode you will need to write the Temperature_Bias_Pin command as described in the UCD90xxx Sequencer and System Health Controller PMBus Command Reference. In summary the command has a bit to enable the Temperature Bias Pin mode and five bits for selecting the GPO pin used.

    There is an I2C tool that can be accessed by choosing from the Windows Start menu All Programs-->Fusion software Texas Instruments Fusion Digital Power Designer-->Tools-->SMBus and SAA Debug Tool. You can use this tool to access the TEMPERATURE_BIAS_PIN command.

     

  • 0 in reply to MikeV
    TI__Intellectual 2340 points

    Marc,

    I would like to know if this information was of help.